Display Panel Data-Line Selection for Longer Scan Active Intervals
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Solution Overview
Problem
Existing display devices face challenges in securing an active interval of a scan signal while reducing the number of channels in the source driving circuit, leading to potential image quality issues.
Innovation Solution
The display device incorporates a selection circuit between data lines and a source driving circuit, utilizing a first and second latch with variable control signals to selectively connect data lines, allowing for non-overlapping selection intervals and enhanced data charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of channels in the source driving circuit is reduced, then device complexity is decreased, but the active interval of scan signal is insufficient
Solution Approach 1:
The invention divides the data lines into multiple groups and uses a selection circuit to selectively connect different groups to the source driving circuit at different time intervals. This segmentation allows the source driving circuit to serve multiple data line groups sequentially, reducing the number of channels needed while ensuring each group receives sufficient active interval for proper scanning and data charging.
Solution Approach 2:
The invention implements dynamic switching between different data line groups using a selection circuit controlled by control signals. The connection between the source driving circuit and data lines is not static but dynamically changed over time, allowing the system to adaptively allocate the active interval to different groups while maintaining reduced channel count.
2Ease of manufacture
If the number of channels in the source driving circuit is reduced, then manufacturing cost is decreased, but image quality deteriorates
Solution Approach 1:
By segmenting data lines into groups and sequentially connecting them to the source driving circuit, the invention reduces the channel count (lowering manufacturing cost) while maintaining image quality through proper timing control that ensures each group receives adequate data charging time during its active interval.
Solution Approach 2:
The selection circuit is configured to connect data line groups to the source driving circuit before the scan signal reaches them, ensuring that data is fully charged and ready before scanning begins. This preliminary action maintains image quality despite the reduced number of channels.
3Device complexity
If data lines are selectively connected to reduce channels, then device complexity is reduced, but data charging time may be insufficient
Solution Approach 1:
The invention uses dynamic switching with a selection circuit that connects different data line groups to the source driving circuit at different time intervals. The switching timing is carefully controlled to ensure that each group has sufficient data charging time during its connected interval, preventing time loss despite the reduced channel configuration.
Solution Approach 2:
The selection circuit establishes connections between the source driving circuit and data line groups before data transmission begins, allowing adequate charging time for the data lines. This preliminary connection ensures that data is fully charged before the scan signal reaches the pixels, maintaining proper timing despite fewer channels.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels and a plurality of data lines, a source driving circuit that outputs a data signal, and a selection circuit disposed between the plurality of data lines and the source driving circuit that selectively connects the source driving circuit to some of the plurality of data lines. The source driving circuit includes a first latch that generates line image data, a second latch that receives the line image data from the first latch and outputs the line image data in response to a first latch control signal, and a third latch that receives the line image data from the second latch and outputs the line image data in response to a second latch control signal. The period of the first latch control signal is constant, and the period of the second latch control signal is variable.